This thesis explores the potential of low-enthalpy geothermal systems in the context of heating and cooling applications, addressing the growing demand for energy in these sectors. Geothermal systems offer a sustainable approach to energy production by harnessing a renewable energy source An introduction to geothermal energy is followed by an analysis of the features and advantages of low-enthalpy systems, especially vertical closed-loop designs, while examining their components and regulatory aspects. A comprehensive case study is presented, detailing the process of sizing the geothermal plant, including an analysis of ground characteristics and the building’s energy efficiency. The system design ensures that all energy needs are met autonomously, without supplementary sources.